From: Reyn Vlietstra <reyn.vlietstra@...>
Date: 2005-08-07T11:24:20+09:00
Subject: Re: polymorphism and/or named parameters: the ruby way?

Comming from a C++ background I was also facing the same issue with
methods, not initialize specifically.
I found myself creating methods like: 
* delete_object_by_class(someclass)
* delete_object_by_class_name(classname)
* delete_object_by_name(name)
* etc.

The people on #ruby-lang helped me understand closures a bit better.

So now instead of doing: delete_object_by_class(someclass)
I do, delete_object{|o| o.class == someClass}

By passing the test condition to the method through a block I cut out
quite alot of bad looking code.

On 8/7/05, Eric Mahurin <eric_mahurin@yahoo.com> wrote:
> --- Stephan Mueller <d454d@web.de> wrote:
> 
> > Hi Eric,
> >
> > * Eric Mahurin <eric_mahurin@yahoo.com> [050806 20:25]:
> >
> > > What you are talking about is really method overloading not
> > > polymorphism in my opinion.
> >
> > Yes, I agree. :)
> >
> > > My take on the "ruby way" is to not overload methods by
> > type
> > > like you can easily do in java.  Instead you just make
> > multiple
> > > distinct methods with each method taking its own "type".
> > This
> > > give maximal flexibility with duck-typing.
> > >
> > > There is no reason you can't make multiple new type class
> > > methods that call the normal "new" method - you wouldn't
> > need
> > > an initialize in that case.
> >
> > Something like this?
> >
> >  class MyClass
> >
> >    def new_s(str)
> >      me = super
> >      # do sth with str
> >      return me
> >    end
> >
> >    def new_i(int)
> >      me = super
> >      # do sth with int
> >      return me
> >    end
> >
> >    ...
> 
> I was thinking something like this (I don't think the above
> does what you want):
> 
> class MyClass
>   def self.new_s(s)
>     obj = new
>     # do sth with s and obj
>     obj
>   end
>   def self.new_i(i)
>     obj = new
>     # do sth with i and obj
>     obj
>   end
> end
> 
> 
> 
> 
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> 
> 


-- 
Reyn Vlietstra